<<Curved pods, though, often indicate that seeds have formed in
only one or two of the seed chambers and the empty chamber(s) causes the
curved shape. >>

Just an observation. I get the curved pods if I accidentally break
one of the styles while making the cross. It's a rare occurrence but I've
heard the style "snap." When I follow the development of these damaged pod
flowers, it results in this type of development.

If this happened more frequently, I might see it as an indication that I
should quit using my finger to apply the pollen!